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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Select the Correct Answer for the Following Options: the Basic Gas Obtained When Two Gases React in Presence of a Catalyst and the Reaction is Exothermic. - Chemistry

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प्रश्न

Select the correct answer for the following options:

The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.

विकल्प

  • Hydrogen 

  • Copper [II] oxide 

  • Oxygen 

  • Copper [II] hydroxide 

  • Ammonia

MCQ

उत्तर

Hydrogen

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अध्याय 5: Language of Chemistry - Objective Type Questions

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विराफ जे दलाल New Simplified Middle School Chemistry [English] Class 7
अध्याय 5 Language of Chemistry
Objective Type Questions | Q 1.2

संबंधित प्रश्न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Iron pipes coated with zinc do not get rusted easily.


Define catalyst.


Give reason .

A person suffering from acidity is advised to take an antacid.


Fill in the blank:
The substances which undergo chemical change are called _______


Write true or false  :
No new substance is formed during a chemical reaction.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Oxygen is a ______ in respiration.


Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

The conversion of ferrous sulphate to ferric sulphate is ______ reaction. 


Complete and balance the following reaction:

\[\ce{Pb(NO3)2 ->[\Delta]}\]


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.


Give balanced equation for the following conversion affected by heat alone on the substance:

Ammonium dichromate to nitrogen


State the following reaction represent oxidation or reduction.

\[\ce{Cl- ->Cl}\]


Explain the term chemical reaction with special reference to reactants and products.


Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.


Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Calcium hydroxide.


True or False. If false, give the correct answer.

Taking a glass of water and freezing it by placing it in the freezer is a chemical change.


Higher order Thinking question

A very hot glass on putting in cold water cracks. What does this change indicate?


_____ is the basic material to manufacture urea.


When lithium metal is placed in hydrochloric acid, _______ gas is evolved.


A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?


Chemists identify gypsum as a natural indicator.


Write word equations for two chemical reactions with the help of materials given in the box.

Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water


Galvanization is a process in which ______ is coated as a layer of iron.


What is thermochemical reactions?


Define the following term:

Chemical change


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